It's the anonymity.
In Ye Olden Times we all had blogs and shit we didn't give out IRL, and, importantly, could abandon without actual social consequences. If this place gets on my nerves I can just peace out, social media just doesn't allow you to disappear and have the furor over your stupidity die, it echoes that feedback into a loop amplifying the judgement but not the apology...forever. That was a fucking mistake, especially for tweens. How many of you would want your future (current) coworkers reading your teenage blogs, or physical journals? I'd be cringing in the corner myself...and that's honestly probably healthier. You should be able to be an idiot at 14 and not have your future employers know that you, like every other human, were once a child who acted like it. We should be able to grow up without the entire world having a say, and that should include past "the 13 year olds can't register" nonsense that prevents nothing.
The solution isn't the GDPR though, once you put your stupid shit out there, it stays out there. Except the "person" owning it should be an at least semi-anonymous identity you won't be tied to for life. We generally don't track these girls once they get a life, we allow 20 year olds to ditch their bullshit and grow up. Hell, we occasionally cheer them on. Social media has the entire school knowing who you want to kiss, instead of just sharing your blog with your bestie, and that will never die. IRL these girls will never be able to walk away from this shit, and it never would've turned into THIS in the first place because they used to have to seek each other out.
Kids these days (lol) have no fear of the internet. Or the wrong fear. I was also a teen girl online once, like approximately half of you, difference being my (our?) generation of teens was told to never give out anything from our real lives, and that's allowed us to look back and cringe without worrying about our job prospects. Fuck "receipts", teenagers are idiots, let them be idiots without the entire fucking world having a chance to insult them for it. Leave that to their fellow idiots.
I also hate SaaS, IoT, AI "art" and "writing", and that no one owns anything anymore, but that's only relevant to internet 2.0, not this thread/board.